On Monday's full episode of "Elizabeth Vargas Reports": The latest as the U.S. Coast Guard pursues a sanctioned oil tanker that was headed to Venezuela, identifying it as part of Venezuela’s “shadow fleet” operating in violation of U.S. sanctions. Plus, published reports say accused double murderer Nick Reiner has been diagnosed with schizophrenia but recently had a change in his medication for the mental illness. Did that switch lead to the alleged stabbings of his parents, Rob and Michelle Reiner? Or could his defense team just be setting up an insanity defense? And Grammy and Emmy-award winning music icon Barry Manilow delivered devastating news to his fans, announcing a diagnosis of lung cancer that requires immediate surgery. #Venezuela #NickReiner #BarryManilow